Question about 1991 Chevrolet S-10

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I need to adjust my idle on a 1991 chevy s-10 carb

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This should have a throttle body, not a carb. You can tell easilly by looking at it. You will have injectors on it and two sensors. One is a throttle position sensor and the other is an idle air control valve. make sure the throttle body is not coked around the throttle plate. Clean if nessasary which will allow more air to pass which will tell the computer to add more fuel. Also remove the IAC and clean it. If its coked it also will restrict the air at idle. Disconnect the battery so the IAC wil reset itslf or it may take a little driving after you clean them to reset. If this doesn't help you may need new injectors because they may be clogged or you may need a new IAC valve.

Posted on May 05, 2010

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